但是现实中，由于客户关系的复杂性和不确定性，很难准确计算客户生命周期价值。
In reality, it is difficult to make accurate calculations of customer lifetime value due to the complexity of and uncertainty surrounding customer relationships.
世界的复杂性和不确定性被抽象、升华在秩序井然的数字中。靠着那一把字符，我们就能够把握宇宙自身。
The world's complexities and uncertainties are distilled and set in orderly figures, with a handful of characters sufficing to capture the universe itself.
介绍了整个的系统是复杂的和高不确定性的，Neward会仔细描述技术在实际工作中的复杂性。
Recognizing that enterprise systems are complex and highly variable, Neward is always careful to describe the context in which these techniques will actually work.
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